US20040001742A1 - Machine tool comprising a braking apparatus for a machine part - Google Patents

Machine tool comprising a braking apparatus for a machine part Download PDF

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Publication number
US20040001742A1
US20040001742A1 US10/376,370 US37637003A US2004001742A1 US 20040001742 A1 US20040001742 A1 US 20040001742A1 US 37637003 A US37637003 A US 37637003A US 2004001742 A1 US2004001742 A1 US 2004001742A1
Authority
US
United States
Prior art keywords
brake
distance
machine
braking
distance measuring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/376,370
Other languages
English (en)
Inventor
Armin Bornemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deckel Maho Pfronten GmbH
Original Assignee
Deckel Maho Pfronten GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deckel Maho Pfronten GmbH filed Critical Deckel Maho Pfronten GmbH
Assigned to DECKEL MAHO PFRONTEN GMBH reassignment DECKEL MAHO PFRONTEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BORNEMANN, ARMIN
Publication of US20040001742A1 publication Critical patent/US20040001742A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25—Movable or adjustable work or tool supports
    • B23Q1/26—Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/28—Means for securing sliding members in any desired position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/007—Arrangements for observing, indicating or measuring on machine tools for managing machine functions not concerning the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • B23Q5/58—Safety devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/406—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by monitoring or safety
    • G05B19/4065—Monitoring tool breakage, life or condition
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/37—Measurements
    • G05B2219/37252—Life of tool, service life, decay, wear estimation
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/41—Servomotor, servo controller till figures
    • G05B2219/41279—Brake
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/309576—Machine frame
    • Y10T409/309912—Machine frame including relatively movable components and means to relatively immobilize these components

Definitions

  • the present invention relates generally to machine tools, and more specifically to machine tools having at least one motor-driven, movable machine part to which a braking apparatus, a distance measuring device, as well as a control unit with a display, are provided.
  • Motor-driven, movable machine parts include vertically movable panels and slides as carriers of workpiece tables and spindle heads. These machine parts may weigh several tons.
  • the drive systems for these machine parts are provided with an operational brake, usually in the form of a “motor brake.”
  • an operational brake usually in the form of a “motor brake.”
  • additional safety brakes are provided, automatically reacting during maintenance or repair work, to prevent spontaneous slipping of the heavy, vertically movable machine parts and to eliminate danger while the operational brake is turned off.
  • these safety brakes are in addition to the operational brakes.
  • this object is achieved by having a monitoring device for the brake effect of the respective braking apparatus.
  • the monitoring apparatus includes a memory unit that contains stored reference values and a comparator for detecting a deterioration of the braking effect. This is achieved by comparing a stored reference value with the measured values from the distance measuring device and activates a display.
  • an important aspect of the invention is the automatic monitoring of the brakes of the vertically movable machine parts by a pre-selected response of the machine control. From the construction data of a new machine, it is known what distance a movable machine part will move after the associated brake has been activated, for example, by operating the emergency stop button, by opening the cabin door, or by releasing the permissive button. That distance (the braking distance) is generally only about a few ⁇ fraction (1/100) ⁇ mm long and is stored as a reference value in the memory unit of the monitoring device. During each braking operation, the distance covered by the machine part after the activation of the brake is detected as an actual value by the distance measuring device and compared with the reference value in the comparator.
  • the monitoring device If the reference value is exceeded by a predetermined and stored amount, the monitoring device outputs an optical or acoustic early indication or warning signal. This informs the user of an already advanced wear of the brake, that is, a certain degradation of the braking effect. This indication may, for example, also be used to determine when the next inspection is due.
  • the program control deactivates the machine. This preferably occurs in combination with a simultaneous activation of the optical or acoustic indication.
  • the invention also contemplates an analogous monitoring of the braking apparatus of horizontally movable machine components. These can be movable columns, slides, workpiece tables, or the like. In these cases, the invention prevents an override of the distances due to brake wear, where the distances are predetermined by the program or set manually.
  • the monitoring system according to the invention is independent of the functionality of the one or the other brake type, since it is based on the distance measurement and the respective reference values or distances. Since a single error in the one or the other braking apparatus may not lead to the loss of the safety function, the monitoring system according to the invention is redundant and indicates the ultimately decisive overall effectiveness of the brake systems involved.
  • FIG. 1 is a perspective view of one embodiment of the machine tool according to the present invention.
  • FIG. 2 is a flow diagram of the steps carried out during a brake monitoring operation.
  • the basic milling machine shown in FIG. 1 is intended for illustrating the invention herein.
  • the machine comprises transverse bed 1 sloping rearwardly, and on the front side of which is mounted workpiece table 2 .
  • Slide 4 is movably mounted on parallel guide rails 3 in the direction of a first coordinate axis and is supported on the transverse bed.
  • Column 6 is movable along a second horizontal coordinate axis on guide rails 5 of slide 4 .
  • the drives for the movements of slide 4 and column 6 are electric motors 7 and 8 , which include integrated operational brakes connected to spindle drives via V-belts.
  • Panel 10 carrying spindle head 11 with integrated work spindle 12 , is movable along the vertical coordinate axis on front guide rails 9 of column 6 .
  • Electric motor 13 including integrated operational brake 14 , is mounted on column 6 as a drive for the vertical movements of the spindle head. Motor 13 is connected to vertical spindle drive 15 via a V-belt, for example.
  • FIG. 1 schematically shows only linear scale 20 and corresponding reading unit 21 , which reading unit is mounted to panel 10 .
  • safety brake 23 is provided which is also connected to NC controller 25 .
  • Monitoring device for the brake effect of brakes 14 and 23 comprises a memory for certain brake data and a comparator for comparing the braking distances detected by the distance measuring means 20 and 21 with the reference values stored in the memory, are integrated in NC controller 25 . The function of the monitoring device will now be described.
  • a reference value, RW is determined and stored for all brakes in the normal state by authorised personnel.
  • the RW is composed of a response delay, dt, and a brake value, d tB .
  • the response delay, dt represents the period between the deactivation of the drive, or the simultaneous activation of the associated brake, and the response of the brake or the distance the machine part has moved within this period.
  • the brake value, dtB is the value from the response of the brake to the standstill of the stopped machine part.
  • An early warning value, VW which exceeds RW by a predetermined amount, as well as a turn-off value, AB, which is again greater than the early warning value, VW, are stored in the memory simultaneously or automatically.
  • step 27 the brake distance BW detected by the distance measuring device, consisting of dt and d tB , is compared with the early warning value, VW, in the memory unit. As long as BW ⁇ VW holds true, there will be no reaction, that is, the machine and the respective brake are in their normal operating state. If the brake distance, BW, reaches or exceeds the early warning value, VW, but remains below the turn-off value, AW, an early warning message is issued in step 28 by activating the optical or acoustic indication, thereby informing the operator of an advanced wear or other, not yet critical, malfunction of the brake. This allows corresponding measures to be taken. In step 29 it is determined whether the brake distance, BW, reached or exceeds the turn-off value, AW, stored in the memory. If this is the case, the machine is turned off and a corresponding alarm is produced.
US10/376,370 2002-03-05 2003-02-28 Machine tool comprising a braking apparatus for a machine part Abandoned US20040001742A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20203501U DE20203501U1 (de) 2002-03-05 2002-03-05 Werkzeugmaschine mit Bremseinrichtung für ein Maschinenteil
DE20203501.8 2002-03-05

Publications (1)

Publication Number Publication Date
US20040001742A1 true US20040001742A1 (en) 2004-01-01

Family

ID=7968600

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/376,370 Abandoned US20040001742A1 (en) 2002-03-05 2003-02-28 Machine tool comprising a braking apparatus for a machine part

Country Status (4)

Country Link
US (1) US20040001742A1 (de)
EP (1) EP1342532A3 (de)
JP (1) JP2003266278A (de)
DE (1) DE20203501U1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105317892A (zh) * 2014-07-11 2016-02-10 发那科株式会社 具备旋转台的机床
CN106715043A (zh) * 2014-09-19 2017-05-24 德马吉森精机有限公司 机床和制动器检查方法

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615373A (en) * 1949-02-15 1952-10-28 G S P Soc Atel Safety stopping device for movable machine-tool members
US3931727A (en) * 1974-09-09 1976-01-13 Verson Allsteel Press Company Method and system for detecting brake wear in a metal forming machine
US4048886A (en) * 1976-09-16 1977-09-20 Xenex Corporation Brake monitor with self-checking
US4057713A (en) * 1976-07-07 1977-11-08 Firan Electronics, Inc. Press true-hit safety counter
US4161649A (en) * 1977-12-21 1979-07-17 American Motors Corporation Multimode electronic brake monitor system
US4177517A (en) * 1976-07-07 1979-12-04 Mette Klaus H Monitoring device for power presses
US4290514A (en) * 1977-11-17 1981-09-22 Wickman Machine Tool Sales Limited Clutch protection device
US4429627A (en) * 1981-05-19 1984-02-07 Edsoe Lennart Method and apparatus for monitoring a press
US4631722A (en) * 1982-02-11 1986-12-23 Zf-Herion-Systemtechnik Gmbh Electronic controller for cyclically operating machinery
US4852434A (en) * 1985-12-28 1989-08-01 Paul Forkardt Gmbh & Co. Kg Machine tool with a sliding screw drive
US5303641A (en) * 1989-11-22 1994-04-19 Gallandere Jean Pierre Method for checking the driving and control system of hydraulic punch brakes
US6138801A (en) * 1997-11-14 2000-10-31 Toyota Jidosha Kabushiki Kaisha Electrically operated brake including two electric motors connected to planetary gear device, and braking system including such brake or brakes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4307482A1 (de) * 1993-03-10 1994-09-22 Max Rhodius Gmbh Werkzeugmaschine
DE4422497C2 (de) * 1994-06-28 1996-06-05 Leuze Electronic Gmbh & Co Vorrichtung und Verfahren zum optoelektronischen Erfassen von Gegenständen
DE19746065A1 (de) * 1997-10-17 1999-04-22 Heidenhain Gmbh Dr Johannes Verfahren und Schaltungsanordnung zur Überwachung der Regelbarkeit von Elektromotoren
DE59814122D1 (de) * 1997-12-06 2007-12-20 Elan Schaltelemente Gmbh & Co Verfahren zur Überwachung einer technischen Anlage, insbesondere eines Handhabungsgerätes, sowie Überwachungs- und Steuergerät

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615373A (en) * 1949-02-15 1952-10-28 G S P Soc Atel Safety stopping device for movable machine-tool members
US3931727A (en) * 1974-09-09 1976-01-13 Verson Allsteel Press Company Method and system for detecting brake wear in a metal forming machine
US4057713A (en) * 1976-07-07 1977-11-08 Firan Electronics, Inc. Press true-hit safety counter
US4177517A (en) * 1976-07-07 1979-12-04 Mette Klaus H Monitoring device for power presses
US4048886A (en) * 1976-09-16 1977-09-20 Xenex Corporation Brake monitor with self-checking
US4290514A (en) * 1977-11-17 1981-09-22 Wickman Machine Tool Sales Limited Clutch protection device
US4161649A (en) * 1977-12-21 1979-07-17 American Motors Corporation Multimode electronic brake monitor system
US4429627A (en) * 1981-05-19 1984-02-07 Edsoe Lennart Method and apparatus for monitoring a press
US4631722A (en) * 1982-02-11 1986-12-23 Zf-Herion-Systemtechnik Gmbh Electronic controller for cyclically operating machinery
US4852434A (en) * 1985-12-28 1989-08-01 Paul Forkardt Gmbh & Co. Kg Machine tool with a sliding screw drive
US5303641A (en) * 1989-11-22 1994-04-19 Gallandere Jean Pierre Method for checking the driving and control system of hydraulic punch brakes
US6138801A (en) * 1997-11-14 2000-10-31 Toyota Jidosha Kabushiki Kaisha Electrically operated brake including two electric motors connected to planetary gear device, and braking system including such brake or brakes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105317892A (zh) * 2014-07-11 2016-02-10 发那科株式会社 具备旋转台的机床
CN106715043A (zh) * 2014-09-19 2017-05-24 德马吉森精机有限公司 机床和制动器检查方法
US10507559B2 (en) 2014-09-19 2019-12-17 Dmg Mori Co. Ltd. Machine tool and brake checking method

Also Published As

Publication number Publication date
JP2003266278A (ja) 2003-09-24
EP1342532A2 (de) 2003-09-10
EP1342532A3 (de) 2003-11-05
DE20203501U1 (de) 2002-06-27

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DECKEL MAHO PFRONTEN GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BORNEMANN, ARMIN;REEL/FRAME:014064/0070

Effective date: 20030305

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION